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--- arduino:stm32_blue_pill [2021/07/02 18:46] – [Hardware] mithat
+++ arduino:stm32_blue_pill [2021/07/02 18:58] – [Hardware] mithat
@@ Line 13: / Line 13: @@
 ==== Hardware ====
-In addition to a "Blue Pill," you will need a **3.3V USB to serial converter**. I used a [[https://www.sparkfun.com/products/14050|SparkFun Serial Basic]] configured for 3.3V. Only the TX and RX pins and, optionally, power will be used, so you should be able to use a standard FTDI board as well.
+In addition to a "Blue Pill," you will need a **3.3V USB to serial converter**.
+Lots of pins on the STM32F103C8T6 are purported to be 5V tolerant. The main DC isn't, and I don't know if TX/RX are. So, play it safe and use a 3.3V serial converter. I used a [[https://www.sparkfun.com/products/14050|SparkFun Serial Basic]] configured for 3.3V. Only the TX and RX pins and, optionally, power will be used, so you should be able to use a standard FTDI board as well.
 <WRAP center round alert 90%>
-=== Mind the voltages! ===
-Some serial converter boards put out 5V as VCC even when set to 3.3V mode. Applying 5V to the 3.3V main supply line of a Blue Pill will kill it.
+=== Mind the voltages! ===
-Lots of pins on the STM32F103C8T6 are purported to be 5V tolerant, but the main DC isn't. I don't know if TX/RX are.
+Some serial converter boards put out 5V as VCC even when set to 3.3V mode. Applying 5V to the 3.3V main supply line of a Blue Pill will kill it. //Carefully check your 3.3V serial converter board// to see whether the VCC output is 3.3V or 5V.
 There is a 5V input on the Blue Pill and a USB connector that can power the board from 5V. These go through a small 3.3V regulator.